> I'm not convinced spymark is better than just "invisible watermarks", spymark to my ears sounds designed to be sound very negative when invisible watermarks are not always negative, e.g. the counterfeit bank note example.

Bank notes are mainly protected by things that are hard to create without very specialized machines. You can't rely on anything hidden staying unknown and once you know a steganography scheme you can also control it.

> Tech like SynthID I see a net positive especially since it doesn't degrade text quality. I dream about a browser extension running at all times that makes text more translucent based on the confidence of LLM writing[0].

False confidence is a lot worse than no confidence. If such an extension ever becomes popular, people will take anything not marked as AI as gospel.